Conventional design engineering systems aided by computer have their system flow and operation flow programmed to their intended functions and are necessary to revise the system itself to meet environment change. The comprehensive system for design engineering aided by computer (SEABIRD SYSTEM) is able to meet changes in application flexibly by recombining the subsystems, and accordingly has been in use for designing of various kinds including ships design. The system is applied for all operations from key plan (functional design) to yard plan (production design) combining various subsystems prepared in accordance with necessary work flow.